when rebuilding yours a somewhat larger capacity battery would be great as long as your charger can handle it
I have rebuilt about half a dozen battery packs with sub-c Ni-cd batteries from www.battery-replacement.org . It's best to not buy the super high capacity batteries if the original ones were lower. The higher capacity ones may get too hot or kick the breaker off in the charger . (Had that happen once) Other than that one I have had good luck rebuilding batteries. I rebuilt my brothers Paslode framing nailer battery the other day. A new battery was about $57 at Lowes. I rebuilt it for a few dollars. Took five 1.2 volt sub-c Ni-cd batteries. Almost all of the Ni-cd battery packs take the sub-c batteries. They are 1.2 volts each. A 19.2 volt battery pack has 16 sub-c batteries in it. If you are not good at soldering a rebuilding service might be a good alternative if you can find one cheap enough.
Mine is NiMH, but can any type battery go in it? My current battery on the case says Ni-MH. Is Ni-CD better? Plus there wires and a green type of resistor or something, what is this thing? I can solder, but does a regular solder iron and solder work, do I need anything fancy? My battery is 12volts, so I have 10 camcorder batteries. The metal tabs seem to be spot welded, does a solder iron work?
The maH rating is the capacity of the battery to do work. A battery rated at 2200mah will go dead before a battery with a 3300 maH rating. Now this is what I was talking about earlier. You do not want to put huge capacity batteries in there as it may overheat your chargers. I think 3300 would probably be ok in yours but I would not go any higher. I may be wrong on that point. Smaller battery packs like yours may have no problem. My battery pack had 19.2 volts which required 16 cells. Large battery packs get hotter. I only had a problem with one charger that was flaky anyway. The www.battery-replacement.org search I did for those batteries was just an example. Keep this fact in mind....The difference between cheapo drill batteries and high quality batteries like Dewalt, Makita, Panasonic, etc. is the capacity of the batteries in maH. Your bargain basement drill may be 19.2 volts but only have 1000mah rating. Whereas the Makita or other good drills may have a battery with a 3200 maH rating. (Over three times the capacity to do work.) So when rebuilding yours a somewhat larger capacity battery would be great as long as your charger can handle it.
Use only the nimh. The component is probably a heat sensor and should be there. Use electronic solder. Smaller diameter is better. Go to Radio Shack and get there best solder for electronics. Batteries come with tabs that you solder together. Bend them however you need to match the battery pack polarity and solder together. Save the end connectors and sensors etc. I saw a pack of 10 quite reasonable. See the link. It isn't all that hard to do. If someone can assist you in holding stuff it would help.